Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: QUAL É A DATA MÉDIA DE LANÇAMENTO PARA THICKSKIN?
 ###Tabelas: CREATE TABLE —_southern_fells (—_southern_fells_id AUTO_INCREMENT PRIMARY KEY, Peak VARCHAR, Height (m) INT, Prom. (m) INT, Class VARCHAR, Parent VARCHAR) CREATE TABLE studio_albums (studio_albums_id AUTO_INCREMENT PRIMARY KEY, Date of release INT, Title VARCHAR, Label VARCHAR, Oricon peak INT, RIAA cert. VARCHAR) CREATE TABLE table_of_world_organization_of_the_scout_movement_members (table_of_world_organization_of_the_scout_movement_members_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Membership (from 2010) INT, Name of member organization VARCHAR, Year current Scouting organization joined WOSM VARCHAR, Year member organization was founded VARCHAR, Admits boys/girls VARCHAR) CREATE TABLE pool_f (pool_f_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Time VARCHAR, Score VARCHAR, Set 1 VARCHAR, Set 2 VARCHAR, Set 3 VARCHAR, Total VARCHAR) CREATE TABLE fourth_round (fourth_round_id AUTO_INCREMENT PRIMARY KEY, Tie no INT, Home team VARCHAR, Score VARCHAR, Away team VARCHAR, Attendance INT)  
SELECT AVG Date of release FROM studio_albums WHERE Title = thickskin